Datasheet

Clock Functions
Technical Data MC68HC912D60A — Rev. 3.1
146 Clock Functions Freescale Semiconductor
Therefore, if the MCU is powered up without an external clock, limp-
home mode is entered provided the MCU is in a normal mode of
operation.
Figure 11-4. No Clock at Power-On Reset
VDD
Power-On Detector
Clock Monitor Fail
EXTALi
13-stage counter
Internal reset
0 --> 4096
Limp-Home
(Clocked by XCLK)
BCSP
Reset: BCSP = 0
SYSCLK PLLCLK (L.H.) EXTALi
SYSCLK PLLCLK (Software check of Limp-Home Flag) EXTALi
(Slow EXTALi)
0 --> 4096
(Slow EXTALi)